Rinnai introduced the Demand Duo™, a commercial hybrid water heating system. The system combines highly-efficient heat exchanger technologies from Rinnai’s recently-launched 199-Btu, Energy Star-certified C199 condensing commercial tankless water heaters with a 119-gallon tank designed to handle the demands of businesses.
Utilizing a total energy core, Greenheck’s new MiniCore energy recovery ventilator provides preconditioned fresh outdoor air for commercial applications ranging from 300 to 1,000 cfm. The total energy core is constructed of a specially processed hydroscopic resin material layered in a cross-flow corrugated structure that separates the supply and exhaust air, ensuring only fresh air is introduced into the indoor space.
The latest version of the Pottorff ECD-545 5-in horizontal blade, wind-driven rain louver comes with updated AMCA CRP ratings. The ECD-545 now has a Class A rating at a core velocity of 886 fpm for the 29 mph, 3 in/hr simulated AMCA Wind-Driven Rain Test.
Leaning on experience and data from various K-12 cities and projects, the author pursues some less conventional design approaches. They may revolve around radiant heating and/or cooling, but depending on school size and other factors, the smart use of heat recovery, DOAS, and improved central plants could also put a project on the HVAC honor roll.